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-rw-r--r--src/util/metricsbackend.cpp140
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diff --git a/src/util/metricsbackend.cpp b/src/util/metricsbackend.cpp
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+/*
+Minetest
+Copyright (C) 2013-2020 Minetest core developers team
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include "metricsbackend.h"
+#if USE_PROMETHEUS
+#include <prometheus/exposer.h>
+#include <prometheus/registry.h>
+#include <prometheus/counter.h>
+#include <prometheus/gauge.h>
+#include "log.h"
+#include "settings.h"
+#endif
+
+MetricCounterPtr MetricsBackend::addCounter(
+ const std::string &name, const std::string &help_str)
+{
+ return std::make_shared<SimpleMetricCounter>(name, help_str);
+}
+
+MetricGaugePtr MetricsBackend::addGauge(
+ const std::string &name, const std::string &help_str)
+{
+ return std::make_shared<SimpleMetricGauge>(name, help_str);
+}
+
+#if USE_PROMETHEUS
+
+class PrometheusMetricCounter : public MetricCounter
+{
+public:
+ PrometheusMetricCounter() = delete;
+
+ PrometheusMetricCounter(const std::string &name, const std::string &help_str,
+ std::shared_ptr<prometheus::Registry> registry) :
+ MetricCounter(),
+ m_family(prometheus::BuildCounter()
+ .Name(name)
+ .Help(help_str)
+ .Register(*registry)),
+ m_counter(m_family.Add({}))
+ {
+ }
+
+ virtual ~PrometheusMetricCounter() {}
+
+ virtual void increment(double number) { m_counter.Increment(number); }
+ virtual double get() const { return m_counter.Value(); }
+
+private:
+ prometheus::Family<prometheus::Counter> &m_family;
+ prometheus::Counter &m_counter;
+};
+
+class PrometheusMetricGauge : public MetricGauge
+{
+public:
+ PrometheusMetricGauge() = delete;
+
+ PrometheusMetricGauge(const std::string &name, const std::string &help_str,
+ std::shared_ptr<prometheus::Registry> registry) :
+ MetricGauge(),
+ m_family(prometheus::BuildGauge()
+ .Name(name)
+ .Help(help_str)
+ .Register(*registry)),
+ m_gauge(m_family.Add({}))
+ {
+ }
+
+ virtual ~PrometheusMetricGauge() {}
+
+ virtual void increment(double number) { m_gauge.Increment(number); }
+ virtual void decrement(double number) { m_gauge.Decrement(number); }
+ virtual void set(double number) { m_gauge.Set(number); }
+ virtual double get() const { return m_gauge.Value(); }
+
+private:
+ prometheus::Family<prometheus::Gauge> &m_family;
+ prometheus::Gauge &m_gauge;
+};
+
+class PrometheusMetricsBackend : public MetricsBackend
+{
+public:
+ PrometheusMetricsBackend(const std::string &addr) :
+ MetricsBackend(), m_exposer(std::unique_ptr<prometheus::Exposer>(
+ new prometheus::Exposer(addr))),
+ m_registry(std::make_shared<prometheus::Registry>())
+ {
+ m_exposer->RegisterCollectable(m_registry);
+ }
+
+ virtual ~PrometheusMetricsBackend() {}
+
+ virtual MetricCounterPtr addCounter(
+ const std::string &name, const std::string &help_str);
+ virtual MetricGaugePtr addGauge(
+ const std::string &name, const std::string &help_str);
+
+private:
+ std::unique_ptr<prometheus::Exposer> m_exposer;
+ std::shared_ptr<prometheus::Registry> m_registry;
+};
+
+MetricCounterPtr PrometheusMetricsBackend::addCounter(
+ const std::string &name, const std::string &help_str)
+{
+ return std::make_shared<PrometheusMetricCounter>(name, help_str, m_registry);
+}
+
+MetricGaugePtr PrometheusMetricsBackend::addGauge(
+ const std::string &name, const std::string &help_str)
+{
+ return std::make_shared<PrometheusMetricGauge>(name, help_str, m_registry);
+}
+
+MetricsBackend *createPrometheusMetricsBackend()
+{
+ std::string addr;
+ g_settings->getNoEx("prometheus_listener_address", addr);
+ return new PrometheusMetricsBackend(addr);
+}
+
+#endif